I agree with all you are saying about illegal maintenance as a LAME i worked long and hard to pass the exams and dont see why the the public should be put in danger by idiots messing with things that they dont fully understand , my first post was writen to add some balance and to give an insight into the problems from the other side.
From a leagal point of view if work is carried out on an aircraft that requires a CRS then untill that has been raised by a LAME or a person approved by the CAA to do so then the C of A is invalid.